VARIATION IN LARVAL POPULATION AND DEVELOPMENT OF MELOIDOGYNE NAASI IN FIELD SOIL BY A. O. OGUNFOWORA 1) and A. A. F. EVANS Imperial College Field Station, Ashurst Lodge, Ascot, Berkshire, England Second stage larvae of Meloidogyne naasi could be extracted from soil at all times throughout the year but in much greater numbers in spring. Incubation of soil at 20° for a week prior to extrac- tion, or storage at 10° for 4 weeks before such incubation, increased the number of larvae extracted especially between August and April. Nematodes disappeared from soil beneath crops faster than from bare-fallow soil. Only one complete generation of M, naasi was possible in a year. The status of Meloidogyne naasi as a crop pest in Britain is not clear. In Cali- fornia, yield reductions of 50-75 % on barley were seen in the Tulelake area ( Allen et al., 1970); young sorghum was significantly stunted in Kansas (Aytan & Dicken- son, 1969) and grasses elsewhere in the United States have shown damage due to M. ( Sikora et al., 1972). In Europe this species has a similar host range including cereals and grasses (Gooris & d'Herde, 1972; Caubel et al., 1971) but
Nematologica – Brill
Published: Jan 1, 1977
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